What's the loudest horn to fit a '02 Cavalier Base? I drive about 90 minutes everyday and there's always people cutting me off and driving like dicks. And IMO the stock horn is wimpy sounding, so yeah. Thanks in advance!

^ Ha ha! The air compressor to drive the horn is louder than the engine in that Smart car.

I am using the dual horns out of an 07 Grand Prix.. plugs right in. I used to have a set of Caddy Deville horns (there's four horns) but the tone sounded too grampa-car like and wasn't that much louder overall.

You can always get the 4 note horns from an old Buick, Olds, or Cadillac car. They're pretty loud and command attention. All you have to do is tap into the positive wire of your stock horn clip and use the metal of the horn mount as the ground. Get all 4 horns! They're different notes so it helps if the car has all 4 horns.